Shading machine



IIIIII um@ Feb. 1s, 1930. w MURPHY 1,747,315

SHADING MA CHINE Filed June 26. 1928 Patented Feb. 18, 1930 UNITEDSTATES PATENT ori-ICE WILLIAM MURPHY, OF BUFFALO, NEW YORK, ASSIGNOR TORICHARD E. GAVIN, OF BUFFALO, NEW YORK SHADING MACHINE Application filedJune 26,

This invention relates generally to portable shading machines but moreparticularly to the means for mounting the shading screen or mediumthereon.

Its object is to provide a simple, reliable and inexpensive holder orclamping device for detachably connecting the frame or carrer of theshading medium to the machine, such means being constructed and arrangedto firmly secure the frame thereto and permit` of its ready applicationand removal in a minimum period of time.

In the accompanying drawings zp Figure 1 is a perspective view of ashading machine showing my improved holder` applied thereto. Figure 2 isan enlarged sectional top plan view of the holder and its associatedparts. Figures 3, 4 and 5 are transverse sections on the correspondinglynumbered lines in Figure 2.

Similar characters of reference indicate corresponding parts throughoutthe several views.

By way of example, my invention has been shown in connection with ashading machine including a base 1() supported on a board 11 andadjustable to any desired height relative thereto by the upright cornerposts 12. Adjustably mounted on the base for bot-h lateral andlongitudinal movement relative thereto is a sliding plate 13 to thefront end of which is joined the improved holder or clamping device,indicated generally by the numeral 14.

This holder is preferably composed of a bottom plate or fixed jaw member15 and a top plate 16, the front portion of the latter overhanging theformer in the manner shown in Figures 3, 4 and 5 and its rear portionbeing secured to the bottom plate b v screws 17, which engage centeringbosses 18 projecting downwardly from the top plate and seated incorresponding sockets 19 in said bottom plate. At its front andYadjoining sides the top plate has a depending rim or flange 20. The

holder is hinged to swing vertically relatively to the sliding plate 13of the machine and for this purpose the ends of its bottom plate 15terminate in rearwardly-facing hinge lugs 21 carrying pivot pins 22detachably engaging horizontally-swinging levers 23 pivoted -tom of saidframe.

1928. Serial No. 288,522.

at 24 to said sliding plate and joined to each other by a coil spring 25which tends constantly to urge the levers into engagement with the hingepins 22. By swingingthese levers outwardly, the holder may be readilydetached from the machine. The front wall of the bottom plate 15 of theholder is provided adjacent its ends with bearing faces 26 against whichthe back edge of the film or screen-carrying frame 27 is adapted tobear, the screenor other shading medium 26 being glued or otherwisesecured to the bot- Cooperating withthe fixed jaw member 15 for securelyholding thefilm-frame to the holder is an opposing movable jaw 29disposed centrally of the holder and adjustable transversely thereoftoward and from the fixed jaw member. Said movable jaw is substantiallyT-shaped and is arranged beneath the overhanging portion of the fixedjaw, its shank or rear portion 30 engaging a guide way 31 arrangedbetween the contiguous top and bottom faces of the holder-plates 16 and15, respectively, and preferably formed by a recess or groove cut in thetop face of the bottom plate. The head or front portion of the movablejaw engages a similar guide way 32 formed in the rim 2O of the top plate16 and is provided at its front end with a depending gripping flange 33for engaging the front edge of the attaching end of the screenframe, asshown in Figures 1 and 4.

The shank 30 of the movable jaw terminates at its rear end in adepending lug 34 in which an adjusting screw 35 is mounted, its frontend bearing against the rear face of the holder-plate 15, as seen inFigure 4. Coil springs 36 are interposed between the fixed jaw plate andthe head of the movable jaw for urging the latter forwardly or away fromthe fined aw to permit of the insertion and removal of the screen-frameto and from the holder. Upon turning the adjusting screw in acounter-clockwise direction the movable jaw is positively shiftedrearwardly to grip the screen-frame, and upon turning the same in aclockwise direction the jaw is shifted forwardly by the springs 36 torelease its grip on the frame.

By this construction and arrangement of parts.y the screen-frame isreliably and firmly held in the holder through the medium of athree-point bearing, including the fixed jaw bearing faces 26 and thegripping flange 33 of the movable jaw 29. Furthermore, the tighteningand loosening of the frame to effect its application and removal to andkfrom the holder is accomplished by a fractional turn of the adjustingscrew 35.

I claim as my invention 1. A holder for the shading medium frames ofshading machines, comprising axed jaw member having an overhanging frontportion for receiving the rear edge and adjoining top side of theattaching end of the frame, a movable jaw slidably mounted on the fixedjaw and extending beneath its overhanging portion, the front end of-said movable jaw terminating in a depending gripping flange arranged toengage the opposing front edge of said frame and its rear endterminating beyond said fixed jaw member and having a lug thereon, andan adjusting screw carried i by said lug and engaging the rear side ofthe fixed jaw member.

2. A holder for the shading medium frames of shading machines,comprising a fixed jaw member having an overhanging front portion forreceiving the rear edge and adjoining top side of the attaching end ofthe frame, said jaw member having a guide way therein below the plane ofits overhanging portion, an opposing jaw slidable in said guide way andterminating at its front end in a depending gripping flange arranged toengage the opposing front edge of said frames and at its rear end beyondthe fixed jaw member in a lug, an adjusting screw carried by said lugand engaging the rear side of said fixed jaw member, and a springinterposed between the latter and said movable jaw.

3. A holder for the shading medium frames of shading machines,comprising a plate adapted to be hingedly connected to the machine andincluding bearing faces for the rear edge and adjoining top side of theattaching end of the shading medium frame,

a movable jaw slidably mounted substantially centrally of said plate andhaving a depending gripping flange in opposed relation to the rear edgebearing face of said plate and arranged to engage the front edge of saidframe, an actuating screw for positively shifting the movable jaw togripping position, and a spring for urging the latter to its releasedposition.

WILLIAM MURPHY.

